Mercury Barometers on Different Planets
What would happen if you brought a mercury barometer to Earth, the Moon, Mercury, Venus, and Mars? Here, we assume that the mercury barometer has a U-shaped tube: one side is open, and the other side … more
Spectrum Analysis of Sound
This simulation analyzes the sound around you and displays it as a spectrum. The simulation works by recognizing the surrounding sounds. In the case of PC, please grant permission to use the microphone. Voice data is … more
Density distribution in the atmosphere
Observe how the density distribution of the atmosphere changes as gravity (gravitational acceleration) is varied. The total kinetic energy of the air particles is assumed to be constant. Gravity is assumed to act uniformly, and no … more
4-stroke engine
Heat engine A heat engine is a machine that operates by moving energy from a hot space to a cold space. In this process, the heat engine converts some of the heat energy into mechanical energy. … more
Torricelli’s Experiment
Torricelli’s Experiment The first person to measure the magnitude of air pressure is Italian scientist Torricelli. He was filled with mercury (Hg) in a glass tube with one end blocked. And he stood upside down in … more
Boyle’s J Tube experiment
Boyle’s J-tube experiment Boyle’s J-tube experiment is an experiment that Boyle did to prove his law. Boyle experimented with pouring mercury into a J-shaped glass tube with one side blocked. At first, the heights of mercury … more
Doppler Effect and RedShift
Doppler Effect By listening to the ambulance’s siren, we can tell if the ambulance is coming or going. When an ambulance approaches with a siren, the sound wave’s wavelength becomes shorter (higher note), and when it … more
Sound pitch and volume
Hz Height and loudness of the sound When we often say that a sound is ‘low’ or ‘high,’ we are referring to the height of the sound. The height of the sound is completely different from … more
Pressure, buoyancy, and gravity applied to a balloon
Assume the pressure inside and outside the balloon is equal at 1 atmosphere. For ease of calculation, the volume and mass of the balloon and string are assumed to be zero. Pressure on a Balloon In … more
Drinks in a straw aren’t pulled, they’re pushed.
Drinks in a straw aren’t pulled, they’re pushed. When we say ‘straw,’ most people picture liquid being sucked upward. But scientifically, that’s not what happens. The liquid doesn’t rise because of suction; it rises because the … more
Pressure and Pressing Area
Pressure is defined as the force applied per unit area. When the same force is applied to two different surfaces, the pressure depends on the size of the area: the larger the area, the smaller the … more